This isn't just EU - But it's happening A LOT on US servers too - Ruin battlegroup. It's also happening to not just Alliance but Horde aswell. It kinda sucks really badly, I've seen some of my guildies get a bit frustrated over the fact that, we queue with a typical / balanced 5 man group, and the other 5 pugs on our team, maybe ONE of the pugs are decently geared. The rest just freaken suck. And it's all hunters and rogues.
How can we fix this problem?
To get noobs out of the BG, my AFK macro is usually 100% affective... The reason why? Well to be frank, I threw a little bit of a mod / coding spin on it and changed the color that would appear to everyone as yellow instead of the light brownish color... Yes.. It's against the rules technically... And you may get muted for an hour if someone actually reports it... But meh.
As for seeing BG's of nothing but hunters and rogues? There's not too terribly much we can do other then to just not roll those classes, if you already rolled one of those, start working on something new. (Preferably a healer... Don't see enough of those anymore...)